It's not a matter of "misprint". I've spoken to Jim Mattison about this.
348 = H.O. 348 + 611 = RA (later called RA III).
Steve is a legitimate Comanche Firebird owner who has a non-pan car with an invoice stating RA. Just words in a database. An original consumer sales invoice or factory window sticker would be a nice find to further research this topic.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching